physics

Question 1

exact values

Answer 1

have infinite number of significant digits
it includes:
counted values-directly counted (ex 20 cats)
defined values-always true,constant measures

Question 2

accuracy

&precision

Answer 2

• accuracy measures how close a measurement is to the actual value
  it is expressed as a percent value
  poor accuracy results from flaws in equipment or procedure

Precision measures repeatability or consistency
it is expressed as the accepted value
poor precision is caused by the experimenter

Question 3

what is a scalar quantity

Answer 3

any quantity that has magnitude(size),but no direction
ex.
distance
types of speed
 speed calculations 
distance-time

Question 4

vector quantity

Answer 4

a quantity that has magnitude( a size,number) and direction. Direction is shown by drawing an arrow above the unites symbol

Question 5

what are the three types of speed

Answer 5

CONSTANT SPEED
aka uniform motion
an object traveling at a constant speed is moving at the same speed for a period of time

AVERAGE SPEED
the total distance over total time

INSTANTANEOUS SPEED
the speed at a particular moment in time
it is not affected by an objects previous speed of how long it has been moving

Question 6

acceleration

Answer 6

symbol = a
units are m/s or km/h/s
it is a measurement of the rate of change in speed per unit of time